Could water sanitation be assisted by pumping the water past strong UV lights? I've heard of this being used in addition to filtration to lower the use of chlorine in pools. I've not done much research into the subject as my hot tub project is rather far down my list. Here's some basic info I found on the subject from googling a bit. Using UV For Sanitation
Jimmy Diresta posted a book binding video via Make on youtube recently. I'll post the link here in case anyone is interested in seeing this process in action.